Water-still.



R. P. BARNSTEAD. WATER STILL.

APPLICATION FILED NARA, 1905.

PATENTED JUNE 12, 1906.

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UNITED STATES PATENT OFFICE.

ROBERT P. BARNSTEAD, OF BOSTON, MASSACHUSETTS. V

WATER-STILL. A I

Specification of Letters Patent.

Eatented June 12, 1906.

Application filed March 3.1905. Serial No. 248.208.

T aZZ whom it may concern.

Be it known that I, ROBERT P. BARN- STEAD, a citizen of the United States, and a resident of Boston, in the countyof Suffolk, Commonwealth of Massachusetts, haveinvented certain new, and useful Improvements-in Water-Stills, of which the following is a full, clear, and exact description.

The object of this invention is the effecting of the hereinafter-described improvements in apparatus for the purification'of water by the process of distillation.

Referring to the drawings forming part of this specification, Figure 1 is a central verti-- cal section of the apparatus embodying my invention. Fig. 2 is a plan view of one of the sections of the coils in the evaporator. Fig. 3 is a horizontal section of one of the sections of the coils in the boiler.

The burner 1 is designed to be supplied with common illuminating-gas and to heat the coils 2, located above it, the upper of which is more of a dome in form, being designated by the reference-numeral 3 and shown in section. About the burner and coils is the drum or' casing 4, terminating upwardly in a section 5 of smaller diameter. At the upper end of said smaller section is fixed the evaporator 7 sufficiently smaller in diameter than said section to permit of the heated gases rising up from the burner 1 and escaping i through suitable openings 6 in said casingsection, the evaporator being given a sub stantial heating thereby. In addition, there is within said evaporator a coil or coils 10, connected at their lowermost point to the corresponding part of the coils 2 by means ofthe pipe 13, partially within and partially without said casing, the exterior part having a cook 14 and a check-valve 15 therein. From the'upper part of the coils 10a pipe 11 extends through the casingesection 5 andthencein and down to the top of the dome 3,

a cook 12 being supplied to the part of the pipe 11 exterior to the casing.

' The condenser 20 is of the construction set forth in a patent issued to me in 1891, No. 456,923, the vapor from the vapor-pipe 21 entering the end of the same andpassing through the tubes 20 to the opposite end, where the condensed water escapes through the pipe and worm 25. The condensation is accomplished by the water surrounding saidv tubes, its supply of fresh water coming throughthe pipe 22, cooler 23, and pipe 24. Said cooler consists of a chamber within which is located the worm 25, composing a portion of the water-escape from the con- 31, which communicates with the lower part of the pipe 32, up through the bottom of which rises-the tube 33 open at its upper end, but communicating with the waste-pipe 26. A cook 34 is provided for emptying and cleaning out this pipe 32. The heated water thus coming from the condenser through the pipe 27 passes down through the section 28 to said coil 30, where it is made very hot by the heated gases coming up throu h the coils 2, and the central opening throug the dome 3, and enters the evaporator 7, already at oreven above the boiling-point. Hence it immediately passes into steam and rises up through the. vapor-pipe 21 to the condenser. If more water is admitted through the inletpipe 32 than is sufficient to maintain the predetermined level, the excess passes through the pipe 31 and escapes through the pipe 33, whose open upper end is located at the same height as the proper level of the contents of the evaporator. To supply the boiler-coils 2 with water and to make good whatever is lost through leakage of the steam, any suitable supply-pipe 17 may be provided, enteringl, preferably, the bottom section of the 001 s. 7

It will thus be seen that the heat from the burner 1 is utilized in every possible direction. .First, the heated products of combustion therefrom rise up into contact with the under surface and the sides of the evaporator 7. .The steam from the water in the coils 2 and dome 3 circulates throu h the coils 10 within the evaporator and sti 1 further heats the contents of the latter, and finall heat rising through the center of the co' s and dome 3 raises the temperature of the watersupply to the evaporator to the highest practicable de ree. -As a result of this economy in the utilization of heat I find that the same consumption of as produces several fold more water than 1n my former constructions of still.

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In order both to sufiiciently cool the water issuing from the condenser through the cooler 23, and also to condense the steam rising from the evaporator, considerably more water must be admitted through the intake-pipe 22 than can be utilized in maintaining the supply in the evaporator. The cook 29 is therefore partially closed in order to admit to the pipe 28 only just about enou h to make up the loss in said evaporator. 'Ihe remainder is allowed to flow off through the branch 27 a to the waste-pipe 26. This renders the work of this still entirely automatic, so that after being once adjusted to the conditions of water-supply and burner the still may be left to itself with perfect confidence in its continu ing to produce the desired supply of distilled Water.

What I claim as my invention, and for which I desire Letters Patent, is as follows, to wit:

1. In a Water-still, the combination of a vertically extended sheet metal case, a source of heat within its lower part, a boiler located immediately above said source of heat, an evaporator located within the upper part of'said case and disposed to allow an annular space between its entire periphery and the interior of said case, and a steam-coil within said evaporator communicating with said boiler; the upper part of said case being laterally apertured for the escape of the products of combustion therethrough.

2. A water-still, comprising a source of heat, steam-generator immediately above the same, an evaporator, steam-coils within said evaporator connected with said generator, a condenser taking vapor from said evaporator, means for supplying fresh water to said condenser and taking the same therefrom, a coil of tubing located upon said steamgenerator and receivin the water from said condenser and connections between said coil and evaporator.

3. In a water-still, the combination of a case, a source of heat at its lower part, a steam-generator immediately above the latter, an evaporator located in the upper part of said case, a condenser, connections between said evaporator and condenser, means for supplying Water to said condenser, a coil of piping located above said steam-generator and having its upper end opening through the bottom of said evaporator, an outlet for said condenser, and a connection between said outlet and the lower extremity ofsaid coil; said connection having means for its partial closure.

In testimony that I claim the foregoing invention I have hereunto set my hand this 21st day of February, 1905.

ROBERT P. BARNSTEAD.

Witnesses:

JOHN C. BULLARD, A. B. UPHAM. 

